Fantasy football keeper league?

Adrian Peterson is obvious. Its a tough decision between Rivers, Austin and Boldin. Probably should let Boldin go because Baltimore isn't a p heavy offense so you never know what Boldin is going to do there. Dallas did add a big time WR when they added Dez Bryant so he might take away some of the stats Austin had last year. So when it comes down to it I think you choice has to be Rivers. He is a top 5 fantasy QB and if everyone else decides on keeping there QB it will be hard to find a replacement.